Companies Work on E-Mail Identity System - AP
"With a simple adjustment in your e-mail software, you can pretend to be anyone...To close that loophole, Microsoft and Yahoo! Inc. are each developing systems aimed at authenticating senders of e-mail. America Online Inc. is testing a third...Issues to be worked out for all three systems include how to properly send e-mail from cybercafes, hotels and public Wi-Fi hotspots and how to preserve privacy when using anonymous re-mailers, which are used by whistleblowers and others to intentionally mask the origin of messages..."Some of the things people are used to doing, they won't be able to do it in quite the same way."